Feeding mechanism for hemstitch sewing-machines.



G. M. EAMES n J. S. PINCH. PBEDING MEGHANISM PoR HEMSTITGH SEWING MACHINES.

APPLICATION PILBD MAR. 9, 1911.

Patented Jan. 7, 1913.

` a SHBETS-SHBBT 1.

w/NEssEs:

G. M. EAMES SL J.' S. FINCH. BBDING MBGHANISM FOR HEMSTITGH SEWING MAGHINES.

' APPLICATIQN FILED 111111.11, 1911.

1,049,567, Patented Jan. 7,1913.v

' 3 SHEETS-SHEET 2.

WTNESSES.' Y /Nl/EN-TRS 1 QazrgeJ/'anws ,py/.DJM B, ATTORNEY coLUKMBlA PLANOURAPH C0..WASHINGTON. D. '6.

G. M. EAMES & J. s. PINCE. FBBDING MEGHANISM FOB. HEMSTITGH SWING MACHINES.

APPLIOATION FILED MAR. 9, 1911. 1,049,567.

Patented Jan. .7, 1913.

3 SHEETS- SHEET 3.

coLuMBxA PLANOGRA'PH bo., wAsxNu'roN. D. c.

WU-ED f To THE SINGER `ivriiNurac'-rU-1aiNcr COMPANY; CORPORATION orNEW .innsiif k FEELING ivincHANisMfro'n `Hnitsrir'oii VsnwiNef-iviii'cirirNisis.

15049956@y Y f f Specification of Letters latent, Patented J 3,11, 7, 19137; y .application inea March e, 1911.` seria'i No. 613,224.1l n 'l n Y To all whom t may concern; Y, u plateshown in Figs. lpf'and 2.] 4 isk a Be it known that we, AGEORGE EAMES detail,in perspetlztive',"y kof, i the 'cam-shaft, and JOHN Si FiNoH, citizens of theUn'ited parts carried by said Ashaft and certain ele-` v States, residing at Bridgeport, in the county ments later 'l to bereferred l to kfor rtransmit- ,of Faireld and Stateof' Connecticut," have ting motion from'the main, or yi'ieedlebarf;60

` invented certain new and `useful Improvedriving shaft to the kfeed-dog. i* ,n A u ments in Feeding MechanisiiiforQHeiiistitch-` Referring to4 the drawings, k1' represents Sewing-Machines, of which thel following is/ the sewing machine bed-plate upon which*y i aspeciflcation, referencebeingv had therein is, mounted thebracket arm comprisingcfgh@J 'to the accompanying drawings. i i standard 2 and armbracket. i i

This invention relatesto improvementsrin 4 is the,y mainor needlefb'ar-drivingshaftfeeding mechanisms for hemstitch sewingl mounted tofrotate yin, suitable bearings machines, and has for Lits primary object to formed 1inthe b racket arm, `5 the, bandor? provide a construction that will meet the hand wheel carried by saidJ main shaft, 6 A requirements of fabrics of comparatively the Vloop-taker-actuating shaft mounted to k170.?,

vfirm V.andheavy texture, such as butchers, rotate in suitable bearings formed on; the 1 homespun. and huckaback linen, andy linen underside fof said bed-plate, 7 the :belt for damask, Y n 1 ,Y ,i operatively connectingthe shaft 6 with the` Inv the construction of machines of` the,` shaft 4, and 8 theyjloop-taker shaft connectedl f class herein referred to,the important ob with the shaft Gby bevel gears 9 and l0 ,and 75 ject rsought to `be attainediis to provide a `carryingI at Aits upper endonel form ofyccoin'- feeding mechanism which will insure that monly-employed limp-taker (n0tSh0Wh1) the reverse feed movement will` positionthe 11 .represents the needleecarryiiig bary previously made needle puncture in line mounted to move'rverticallyinfthe head 12,3 n 2,5,4 with the descending needle, as .upon this ofthe arm bracket and provided at its lowergSO,

` largely depends the superior" quality of the end with a' bracket 13 upon which .is pivot-gJ product,` p y allyl mounted the-needle-carrying bracket Hemstitch sewing achines' as heretofore l. 4lll iittedto receive theusual eye-pointedpipvrv constructed, when operatingupon materials `needle( (not shown). ySiecuredin the bracket ,f

3,0 of comparatively light texture,effect,thro{ugh 14, by screw 15, is the llowerfend of a `rod y85` the tightening of the stitch, an opening suf- 16, theV oppositeY end Of which is slidably ficiently large to insure that the needlewilly Connected with arocki-ng stud 17V carriedfby,` i subsequently descend therethrough; but they. a -rock-leverlS pivoted in, the head 1,2, saidz-k fail to produce the desiredk alinement rof rocking stud having threaded into it abstud 7 ,35,` needle andneedle puncturek when operat- Screwy 19;; uponwhich is pivotedoneend -of90.

ffundersde View ofthe sewing-@maChinellbed- @Olljalqmtol onlycbeiilg ing/,upon fabrics of the texture first referred theneedle-vibrating connectionj 20, the opfk to;;wli`erein the tightening of thiefvystitch VlQOSl@@1151*0f Sad COHIIGCOIlwbeDg 0011-12 adds little, if anything,to the size of the nected with the needle-vibrating lever 21A opening made by the needle; n pivoted upon the arm'bracket., n

40 `To overcome this ditculty is the purpose 22 represents the presser-foot'. securedto 95,

of the present invention,andto this end the the lower end of one form ,ofcommonly-- feed actuating elements are kconstructed and employed,presser-carrying bar (not shown) i Y combined to transmit from the' prime memmouwntedin the usual manner to movey ver-v bers ofthetrainsA o-f connections, positively ticallyin the head 12,V 23 thel feed-dog, 24;,

4,5 ,determined oppositely arranged, feed-move:y the throat-plate, 25 the` take-up, and 26 aiidl-0,0k

`mentsfofthefeed-dog.,Y i 27. the usual thread-'check-and,needle-thread In the vaccompanying drawings illustrattension, respectively. yjj, .,.Q ,u f

ing the invention, in theiseveral figures of v 28 grepresents i the 4'oscillati'ng feed-rockl which like partsl` are similarly designated, shaft, and 29 the oscillating feed-lift' rock- 5,0 1/Figure l is a view in front .side elevation ofA shaft mounted f upon pintle -sc'rews',`za`s --30,1Q5 a hemstitchA sewing machine equipped'i withy securediinfsuitablelugs, as :31, dependng. the 'present invention, thel bracket-arm plate from: ythelowerside ofthebed-plate ,1.g`To y, l 'Vandfcamjcovering plate being omitted.,Fig1 thefforwardend 'of the feed rock-shaftiisy y i 2 isatop plan View'` of Fig.4 1 .1 Fig.` rEris an secured, kbyjscreit( 32, a bracket'arm 33 (ther` ries the usual stud screw (not shown) upon which is pivoted one end of the feed-dogcarrying bar 34. The opposite end of the rock-shaft 28 carries a bracket arm 35to the outer end of which is adjustably secured the lower end of the feed rock-shaft connection 36. To the forward end ofthe feedlift rock-shaft 29 is secured, by pinch screw 37, an arm bracket 38 into the arm o-f which is threaded a screw 39, the outer, unthreaded end of said screw .being provided with a slide block 40 which enters the usual slot (not shown) formed in the end of the feeddog-carrying bar 34, the opposite` end of said feed-lift rock-shaft having formed integral with it an arm 41 connected at its outerend with the feed-lift rock-shaft connection 42.

All of the foregoing elements are in construction and operation substantially the same as those commonly employed in connection with the earlier forms of hemstitch sewing machines, except that the lower'end of the connection 36 is adjust-able with respect to the slot 43 formed in the bracket arm 35.

44 represents a cam-shaft which is mounted at one end in a bearing 45, forming a part of the arm bracket, and secured against movement by screwV 46, the opposite end of said shaft resting in a suitable bearing formed in the cam covering plate (omitted from the drawings, but referred to in the matter descriptive of Fig. 1). Upon the shaft 44 is mounted a feed-cam 47 feed-lift cam 48 and a spiral tooth gear-wheel 49, said cams and gear wheel, in the present instance, being formed integral, the gearwheel 49 meshing with the spiral gear 50 carriedby the main shaft 4. The gears 49 and 50 are of the ratio of one tothree, thus giving to said cams one rotation to three rotations of said main shaft.

51 represents the feed-connection rockshaft mounted to oscillate in bearings 52 and 53, said rock-shaft having secured to its inner end, by pinch screw 54, a crankarm 55 provided with a stud bolt 56 (the threaded end only of which is shown) upon which is fulcrnmed the upper end o-f the feed rock-shaft connection 36. Secured upon the rock-shaft 51, by pinch screw 57, is a feed-cam lever 58 provided with a st'nd 59 carrying a cam roller 60 which tracks a cam-groove 61 formed in the feed-cam 47 the median vertical plane of said camgroove being in substantially vertical alinement with the a-Xis of oscillation of the rockshaft 51, thus transmitting from the main shaft, through the connections 50, 47, 58, 51, 55, 36, 35, 2,8, 33 and 34, feed movements to the feed-dog 23. The cam-groove 61 is formed to give to the feed-dog 23 two forward and one backward feed movements for each hemstitch figure, as is common to hemstitch sewing machines, the amplitude of the feed movements of. said feed-dog being governed by the adjustment of the lower end of the connection 36 with respect to the slot 43 formed in the bracket arm 35.

62 represents the feed-lift connection rock-'shaft mounted to oscillate in bearings' 63 and 64, said rock-shaft having secured to itsinner end, by pinch screw 65, a crankarm 66 provided with a stud bolt 67 upon which is fulcrumedy the upper end of the feed-lift rock-shaft connection 42. Upon the rock-shaft4 62 is secured, by pinch screw 68, a feed-lift cam-lever 69 provided with a stud 7 0 carrying a cam roller 71 which latter tracks the cam-groove 72 formed in the feed-lift cam 48, the median vertical plane of said cam-groove being in substantially vertical alineinent with the aXis of oscillation of the rock-shaft 62, thus transmitting from the main shaft, through the connections 50, 48, 69, 62, 66, 42, 29, 38and 40, vertical movements to the feed-dog 23.

73 represents a cam-groove formed in the cam 48, said groove coacting with al follower 74, carried by the needle-vibrating lever 21, to transmit to the needle carrier, through the connections 20, 19, 16 and 14, the lateral movements necessary for the format-ion of a hemstitch figure, the amplitude of said lateral movements being controlled by the adjustment of the end 75 of the connection 20 with respect to the slide-way76 formed in the lever 2l.

Claims 1. In a feeding mechanism for sewing machines, the combination of a bracket-arm, a rotary main-shaft mounted in said bracket-arm, a bed-plate, a feed-dog mounted belowl said bed-plate and connections between said main-shaft and feed-dog for giving to the latter feed andfeed-lift movements, said connections including a feedcam having in its periphery a feed camgroove and a feed-lift cam having in its periphery a feed-lift cam-groove, said cams being located in said bracket-arm and having their axes of rotation lying in a direction transverse to the axis of said mainshaft, said cam-grooves being located one at one side and the other at theopposite side of a vertical planeintersecting the axis of said bed-plate and connections between'said main-shaft and feed-dog-for givingy tothe latter feed and feed-lift movements, said connections including an integrally formed element comprising a feed-cam havingin its I feed-lift cam having inits periphery a feed-lift camperiphery a feed-cam groove, a

groove-and a spirally toothed gear section,

said integrally formed element being lo.- cated in said bracket-arm and having vits axis of rotation lying'in a direction transverse to the axis of said main-shaft, said cam-groove being located one at kone side and the other at the opposite side of avertical plane parallel with and passing through the axis of said main-shaft. n

3. In a feeding mechanism forsewing machines,y the combination rotary main-shaft mounted in said bracketarm, a bed-plate, a feed-dog mounted below said bed-plate and connections between said main-shaft and feed-dog for giving to the latter feed and feed-lift movements, said connections including feed and. feed-lift cams mounted in said bracket-arm, feed, and feed-lift rock-shaftsjournaled beneath said bed-plate, feed and feed-lift connection copies of this patent may be obtained for ve cents each, byy addressing the Washington, D. G.

of a bracket-arm, ak

names to this specification,

rock shafts journaled in said bracket arm lovv said bed-plate, feed and feeds-lift feed-lift connection and feed-lift cams, said feedy and feed-lift connection rocks` shafts and their respective rock-shaftsjour-` l and means kfor t 30` have signed our" naled beneath said bed-plate, actuating said feed and feed-lift cams.y f

In testimony whereof, r`We in the presence of tvvo.` subscribing Witnesses. v l

GEORGE M. EAMES.y y JOHN S. FIN CH. Witnesses:

ABBIE M. DONIEEEQ JAS. J. Cox.

and connectionsbetween Commissioner of Iatents, Y e 

